Pyrographic burner.



No. 870,754. PATENTED NOVl 12, 1907.

. A. M. WILLIAMS.

PYROGRAPHIG BURNER. APPLIOATION I 'ILBD MAR. 30, 1907.

WITNESSES INVENTOH ELYIN MWmTrEM;

B) I 6 M 42 W Mm A TTOHNE Y ALVIN M. WILLIAMS, OF WEST ORANGE, NEWJERSEY.

PYROGRAPHIG BURNER.

Specification of Letters Patent.

Patented. NOV. 12, 1907.

Application filed March 30. 1907- Sarial No. 365,568-

To all whom it may concern:

Be it known that I, ALVIN M. WILLIAMS, a citizen of the United States,residing at West Orange, in the county of Essex and State of New Jersey,have invented a new and useful Improvement in Pyrographic Burners, ofwhich the following is a specification.

This invention relates more especially to the fastening of the shell orburner-tube to the lug or shank ofthe burner, and the objects of theinvention are to secure such an attachment which shall be simple andinexpensive to manufacture; to provide a fastening which shall at thesame time be secure and not liable to be loosened by the expansion andcontraction of its parts under the heat of the burner, and to obtainother advantages and results which may be brought out in the followingdescription.

Referring to the accompanying drawings, in which like numerals ofreference indicate corresponding parts in each of the several figures,Figure 1 is a side elevation of a pyrographic burner of my improvedconstruction; Fig. 2 is a longitudinal central section of the burnerwith the shell forced into place on the lug, the band being not yet inits finalposition; and Fig. 3 is a longitudinal central section of theburner complete.

1n said drawings, 1 indicates the tubular shank or lug, adapted at oneend, as at 2, to be screwed into a handle (not shown), as is common inthe art.

The shell or burner-tube 3 is preferably of platinum with its outer end4 shaped or formed in any suitable manner for accomplishing thepyrographic work to be done, andin its side is the usual vent 5. The endof the lug which is to receive the said shell is exteriorly reduced asat 6, said reduced portion being preferably slightly tapered as shown,and forming where it joins the body of the lug an abrupt shoulder 7.This reduced portion 6 of the lug is adapted to telescopically enter theshell 3 and is made of such size that the said shell must be forced onby a considerable pressure, so that a tight fit or union is secured. Theductility of the shell enables it to stretch slightly when forced on,and the shoulder 7 provides a limiting stop for the end edges of theshell. A band 8 is then forced down over. the shell 3 on the reducedportion 6 of the lug, until it also engages the shoulder '7, as shown inFigs. 1 and 3, said band thus tightly and permanently binding the shell3 to the lug l. Preferably the band 8 is of such thickness that when infinal position its outer surface will be flush with the outer surface ofthe adjacent portion of the lug and form a smooth continuation thereof.

The tubular passage of the lug is denoted by the reference numeral 9, areduced tip 10 being inserted in he forward end of the lug to projectinto the shell, as is common. A spirally coiled wire 11 upon the forwardend of the tip serves to diffuse the gas, as usual.

It will be noted that by my improved construction the inner surface ofthe band 8, for its entire length bears on nothing but the shell,whereby said band can be forced into a most intimate binding relation tothe shell and reduced end portion of the lug.

Having thus described the invention, what I claim as new is:

In a pyrographic burner, the combination of a lug having a reduced end,a shell telescopically receiving said reduced end, and a band separateand independent of the lug arranged on said reduced end and adapted tobear for the whole length of its inner surface only on the said shell.

ALVIN M. WILLIAMS.

In the presence of RUSSELL M. EVERETT, ETHEL B. REED.

